Bag-lifter.



G. L. HOYT.

BAG LIFTER.

APPLICATION FILED MAR. 29, 1911.

Patented July 4, 1911.

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witweooeo z COLUMBIA PLANOGRAPH 620., WASHINGTON, n. c.

G. L. HOYT.

BAG LIFTER.

APPLICATION FILED MAR. 29, 1911. 997, 1 93, Patented July 4, 1911.

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COLUMBIA PLANOGRAPH co WASHINGTON, u. c.

UNITED STATES PATENT OFFICE.

GUY L. I-IOYT, OF NEW YORK, N. Y., ASSIGNOR TO ROBERT GAIR- COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

BAG-LIFTER.

Specification of Letters Patent.

Application filed March 29, 1911.

Patented July 4, 1911.

Serial No. 617,745.

T 0 all whom it may concern:

Be it known that I, GUY L. How, a citizen of the United States, residing at New York city, borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Bag-Lifters, of which the following is a specification.

This invention relates to mechanism for grasping the shorter lip of a flat bag or envelop to draw the latter upon a funnel or other holder, and is applicable to bag-filling machines of the type described in my Patent No. 977,632 of December 6, 1910, or to any mechanism of an analogous character. In the machine shown in my said patent the lifter member which entered the mouth of the bag was a movable one of a pair of jaws arranged to open during the descent of the lifter so as to admit the lip of the bag between them, and then to close upon the bag and draw it upwardly out of the guide or holder in which it was presented. A rearward transverse movement imparted to the bag-entering jaw as it encountered the inner side of the flap or longer lip of the bag caused said lip to be pressed back away from the shorter lip, but this action, while effective under ordinary conditions,- would sometimes fail when the short lip of the bag was cambered in the wrong direction, or curled, or somewhat adherent to the opposite ply.

My present invention has for its object to provide greater certainty in the engagement of the lifter jaws with the shorter lip of the bag under all conditions, and to this end I prefer to make the bag-entering member fixed as to its position transversely of the plane of the bag, to mount the other jaw movably with relation thereto, and to provide a back-presser which comes into action when the bagentering member has encountered the flap, and presses the plies forward, the shorter lip being thereby separated from the flap ply because the latter is restrained by the bag-entering member which thereby acquires an easy and certainentrance.

Of the accompanying drawings, Figure 1 represents a side elevation showing so much of a bag-filling machine provided with my improvements as is necessary to an understanding of the invention. Fig. 2 represents an elevation on an enlarged scale showing the relation of the parts when the lifter first encounters the bag. Fig. 3 represents a plan into a vertical position and presents them one by one to the action of the lifter.

14 is one of a series of horizontally-revolving funnels on which the bags are located by the lifter, and 15 is one of a series of pairs of holder jaws which revolve with the funnels and between which the bags are drawn onto the funnels.

16 is a fixed vertical guide, 17 is a slide or carrier mounted thereon and forming a part of the lifter, and 18, 19, 20 are suitable connections operated from a crank-pin 20 on the power-shaft for reciprocating said slide.

21 is a pendulous bar for operating the movable jaw of the lifter, said bar being hung on a pivot 22 and swung by a horizontal rock-lever 23, link 24:, vertical rocklever 25 having spring 26, and cam 27 on a shaft 28 which receives motion from the shaft 10. These parts are as shown in my former patent and need not-be described in further detail.

29 is the bag-entering member which in this case is a rigid blade or jaw fixed to the slide 17 and moving in line with the guide 13, the latter as before being composed of two side-members separated by a space, as seen inFig. 3. l

30 is the jaw which engages the outer side of the bag-lip, and is in this case pivoted at 31 to the slide 17 and provided with an arm 32 carrying a roller 33 which is held against the edge of the pendulous bar 21 by means of a spring 34-.

35 is a horizontally-swinging back-presser, pivoted at 35 on one of the standards supporting the bearings of the front set of belt rolls, and operated from a cam 36 on the shaft 28 by means of a rock-lever 37 and link 38, 39 being a spring which serves to draw said rock-lever against the cam.

40 is a rise on the pendulous bar 21 serving to retract the movable jaw 30 after the bag has been located upon the funnel 1-1.

While the lifter is descending toward the position represented in. Fig. 2, a bag 41 is presented in the guide 13, and the pendulous bar 21 will be swung inwardly by the action of cam 27 so as to retract the movable jaw 30 and thus allow the shorter lip 42 of the bag to enter between the two jaws. When the lifter reaches the position shown in Fig. 2, the blade or jaw 29 has moved in front of the longer lip or flap 43 of the bag, and'the back-presser 35 by the action of cam 36 has been swung outwardly so as to flex the plies in an outward direction just below the mouth of the bag, thereby causing the shorter lip 42 to separate from the back or flap ply, the fiap 43 being restrained by the fixed jaw 29. The latter thereby gains an easy and certain entrance intothe mouth of the bag and the back-presser 35is retracted in'time to avoid interfering with 29. As jaw 30 comes opposite the shorter lip 42, the pendulous bar 21' swings outwardly and allows said jaw to press against said baglip, whereby the latter is frictionally held between the two jaws, the gripping action being automatically increased by the resistance of the bag because the jaw 30 closes in a downward direction. As the lifter rises, it carries the bag 41 upwardly out of the guide 13 and between the jaws 15 onto the funnel 14c, and jaw 30 is retracted by the cam rise during the latter part of the upward movement. The lifter then descends for another bag and the foregoing operations are repeated, the machine meanwhile operating to bring another funnel into position as described in my aforesaid patent.

I claim 1. In a machine for handling fiat envelop bags, the combination of means for individually presenting the bags, lifting means having a bag-entering jaw and a cooperating jaw adapted to engage between them the shorter lip of the bag, and a presser adapted to externally engage the flap pl and movable transversely of the plane 0 the bag so as to flex the latter and separate the opposite ply from said fiap ply while the flap is restrained by said bag-entering member, and

mechanism for operating said lifting means.

2. In a machine for handling fiat envelop bags, the combination of a guide adapted to present an individual bag, a back presser associated therewith, bag-lifting means including a reciprocating carrier having a fixed bag-entering jaw, and a movable jaw pivoted to close in a downward direction toward said fixed jaw, operating means timed to close said movable jaw upon the shorter lip of the bag when the fixed jaw has entered the bag mouth, and operating means timed to project said back-Presser when said bag-entering jaw has been located opposite the flap of the bag.

In testimony whereof I have hercuntoset my hand in the presence of two subscribing witnesses, this twenty-first day of March, 1911.

GUY L. HOYT.

Witnesses WILLIAM J. DODGE, R. M. PIERSON.

(iopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

